Anti-newton ring sheet, production method therefor, and touch panel using the same

Abstract

An anti-newton ring sheet is provided with an uneven layer. The uneven layer is formed by tightly arranging a plurality of structures in a lattice-like formation. The structures are substantially formed with a polymer resin and have a peak. Here, the axis extending in the vertical direction when the sheet is viewed in plan is the x-axis, and the axis extending in an orthogonal direction to the x-axis is the y-axis. In addition, an arbitrarily defined structure from the structures forming the uneven layer is a base structure, and structures that are adjacent to the base structure along the x-axis and the y-axis are other structures. The uneven layer is formed in a manner such that the height of a vertical section along the direction (x-direction, y-direction) of straight lines connecting the peak of the base structure and the peaks of the other structures periodically changes.

1 . An anti-newton ring sheet having an uneven layer, wherein:
 the uneven layer is substantially formed with a polymer resin by arranging a plurality of structures with peaks in a lattice-like formation; and   when, in a plan view of the sheet, an axis extending in one arrangement direction of the structures is an x axis, an axis extending in a direction orthogonal to the x axis is a y axis, an arbitrarily defined structure from among all the structures forming the uneven layer is a base structure, and the structures adjacent to this base structure on both the x axis and the y axis are other structures,   the uneven layer has a vertical section height changing periodically along a straight line direction connecting the peak of the base structure and the peaks of the other structures.   
     
     
         2 . The anti-newton ring sheet according to  claim 1 , wherein
 a change period of the height is 25 μM to 1000 μM.   
     
     
         3 . The anti-newton ring sheet according to  claim 1 , wherein
 an absolute value of an intersection angle at a position where a bottom surface of the structure intersects with any point on a ridge line of the structure is within 4 degrees.   
     
     
         4 . The anti-newton ring sheet according to  claim 3 , wherein
 the structure is formed with only the polymer resin with no microparticle.   
     
     
         5 . The anti-newton ring sheet according to  claim 4 , wherein
 a hard coat layer is provided on a surface opposite to the surface provided with the uneven layer.   
     
     
         6 . A method for producing the anti-newton ring sheet according to  claim 5 , wherein:
 an ionizing radiation curable resin is used as the resin included in the both of the uneven layer and the hard coat layer; and   while one of the layers is half-cured, the other layer is formed, and the both layers are collectively cured completely.   
     
     
         7 . A resistance film type touch panel formed by disposing a pair of panel plates each having a conductive film so that the conductive films face each other via a spacer, wherein
 one or both of the conductive films are formed on the surface provided with the uneven layer of the anti-newton ring sheet according to  claim 5 .   
     
     
         8 . The anti-newton ring sheet according to  claim 1 , wherein
 an absolute value of an intersection angle at a position where a bottom surface of the structure intersects with any point on a ridge line of the structure is within 4 degrees.   
     
     
         9 . The anti-newton ring sheet according to  claim 1 , wherein
 the structure is formed with only the polymer resin with no microparticle.   
     
     
         10 . The anti-newton ring sheet according to  claim 2 , wherein
 the structure is formed with only the polymer resin with no microparticle.   
     
     
         11 . The anti-newton ring sheet according to  claim 1 , wherein
 a hard coat layer is provided on a surface opposite to the surface provided with the uneven layer.   
     
     
         12 . The anti-newton ring sheet according to  claim 2 , wherein
 a hard coat layer is provided on a surface opposite to the surface provided with the uneven layer.   
     
     
         13 . The anti-newton ring sheet according to  claim 3 , wherein
 a hard coat layer is provided on a surface opposite to the surface provided with the uneven layer.   
     
     
         14 . A method for producing the anti-newton ring sheet according to  claim 11 , wherein:
 an ionizing radiation curable resin is used as the resin included in the both of the uneven layer and the hard coat layer; and   while one of the layers is half-cured, the other layer is formed, and the both layers are collectively cured completely.   
     
     
         15 . A method for producing the anti-newton ring sheet according to  claim 12 , wherein:
 an ionizing radiation curable resin is used as the resin included in the both of the uneven layer and the hard coat layer; and   while one of the layers is half-cured, the other layer is formed, and the both layers are collectively cured completely.   
     
     
         16 . A method for producing the anti-newton ring sheet according to  claim 13 , wherein:
 an ionizing radiation curable resin is used as the resin included in the both of the uneven layer and the hard coat layer; and   while one of the layers is half-cured, the other layer is formed, and the both layers are collectively cured completely.   
     
     
         17 . A resistance film type touch panel formed by disposing a pair of panel plates each having a conductive film so that the conductive films face each other via a spacer, wherein
 one or both of the conductive films are formed on the surface provided with the uneven layer of the anti-newton ring sheet according to  claim 1 .   
     
     
         18 . A resistance film type touch panel formed by disposing a pair of panel plates each having a conductive film so that the conductive films face each other via a spacer, wherein
 one or both of the conductive films are formed on the surface provided with the uneven layer of the anti-newton ring sheet according to  claim 2 .   
     
     
         19 . A resistance film type touch panel formed by disposing a pair of panel plates each having a conductive film so that the conductive films face each other via a spacer, wherein
 one or both of the conductive films are formed on the surface provided with the uneven layer of the anti-newton ring sheet according to  claim 3 .   
     
     
         20 . A resistance film type touch panel formed by disposing a pair of panel plates each having a conductive film so that the conductive films face each other via a spacer, wherein
 one or both of the conductive films are formed on the surface provided with the uneven layer of the anti-newton ring sheet according to  claim 4 .